Kennametal 4033833 Threading Insert Acme 2 Tpi Left Hand

Product Description

The KENNAMETAL 4033833 is a carbide threading insert designed for cutting Acme threads on both internal and external applications. Manufactured in the NA6L2 style with a KCU25 grade carbide substrate, this insert carries an AlTiN finish applied via PVD coating process. The 29-degree included angle and a cutting tip width of 0.1802 inches are matched to the Acme thread standard at 2 threads per inch (TPI). Left-hand orientation makes it suitable for left-hand threaded workpieces. It belongs to Kennametal's Top Notch series and is sold individually with a minimum order quantity of 5 units. Machinists and toolroom technicians use this insert in CNC lathes and manual threading operations.

This insert is intended for Acme thread forms, which appear frequently in lead screws, power screws, vises, and linear actuation hardware across industrial and manufacturing environments. The left-hand configuration is critical for applications where thread direction is specified as left-hand. The Top Notch series is suited for medium to heavy threading passes where a secure insert-to-holder connection is required. Shops performing both internal and external threading on a single setup will find the dual-rated thread type designation useful for reducing changeovers.

Key Features

• KCU25 carbide grade with PVD-applied AlTiN finish for wear and heat resistance
• 29-degree included angle matched to the Acme thread standard
• 2 TPI internal pitch for coarse Acme thread profiles
• Left-hand insert orientation for left-hand threaded components
• Rated for both internal and external threading operations
• Top Notch series seating geometry for positive insert location

Compatibility

Designed for use with Top Notch series threading toolholders that accept NA style, size 6 inserts. Confirm holder compatibility with the NA6L2 insert style before ordering.

Installation Notes

Installation should be performed by a qualified machinist following the toolholder manufacturer's torque and clamping procedures for Top Notch series inserts. Ensure the machine spindle is fully stopped and the tool turret is locked before seating or removing the insert. Verify left-hand orientation and thread direction on the workpiece setup before initiating a threading pass. Do not exceed the recommended depth of cut or feed rate for the KCU25 grade in the material being threaded.